US8908315B2 - Evaluation method of magnetic disk, manufacturing method of magnetic disk, and magnetic disk - Google Patents
Evaluation method of magnetic disk, manufacturing method of magnetic disk, and magnetic disk Download PDFInfo
- Publication number
- US8908315B2 US8908315B2 US13/074,369 US201113074369A US8908315B2 US 8908315 B2 US8908315 B2 US 8908315B2 US 201113074369 A US201113074369 A US 201113074369A US 8908315 B2 US8908315 B2 US 8908315B2
- Authority
- US
- United States
- Prior art keywords
- magnetic disk
- evaluation method
- magnetic
- lubricant
- properties
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/455—Arrangements for functional testing of heads; Measuring arrangements for heads
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
- G11B5/3133—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure
- G11B5/3136—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure for reducing the pole-tip-protrusion at the head transducing surface, e.g. caused by thermal expansion of dissimilar materials
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/60—Fluid-dynamic spacing of heads from record-carriers
- G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
- G11B5/6011—Control of flying height
- G11B5/607—Control of flying height using thermal means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8408—Processes or apparatus specially adapted for manufacturing record carriers protecting the magnetic layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49764—Method of mechanical manufacture with testing or indicating
Abstract
Description
- PTL 1: Japanese Unexamined Patent Application Publication No. 2002-74648
TABLE 1 | ||
Lubricant of sample media |
Film | Film | Film | |||
thickness: | thickness: | thickness: | |||
Push-out | small | medium | large | ||
Comparative | −2 nm | 1 | 1 | 1 |
Example 1 | ||||
Comparative | Zero (contact) | 1 | 1 | 2 |
Example 2 | ||||
Example 1 | +1 |
2 | 2 | 4 |
Example 2 | +2 nm | 4 | 5 | 5 |
TABLE 2 | ||
Carbon protective film of sample media |
Film | Film | Film | |||
thickness: | thickness: | thickness: | |||
Push-out | small | medium | large | ||
Comparative | −2 nm | 1 | 1 | 1 |
Example 3 | ||||
Comparative | Zero (contact) | 1 | 1 | 1 |
Example 4 | ||||
Example 3 | +1 nm | 3 | 2 | 1 |
Example 4 | +2 |
5 | 3 | 1 |
- 1. In the case of Push-out plus (pushing-out), the thickness limit of the lubricant can be more clearly detected than the evaluation with the Push-out zero (contact);
- 2. In the case of Push-out plus (pushing-out), the protective film thickness limit can be more clearly detected than the evaluation with the Push-out zero (contact); and
- 3. It is effective to select the amount of Push-out in accordance with the purpose of the evaluation. For example, a favorable evaluation can be made for the lubricant pickup by reducing the Push-out amount rather than wear of the protective film.
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-075291 | 2010-03-29 | ||
JP2010075291A JP5574414B2 (en) | 2010-03-29 | 2010-03-29 | Magnetic disk evaluation method and magnetic disk manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
US20120077060A1 US20120077060A1 (en) | 2012-03-29 |
US8908315B2 true US8908315B2 (en) | 2014-12-09 |
Family
ID=44941198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/074,369 Expired - Fee Related US8908315B2 (en) | 2010-03-29 | 2011-03-29 | Evaluation method of magnetic disk, manufacturing method of magnetic disk, and magnetic disk |
Country Status (2)
Country | Link |
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US (1) | US8908315B2 (en) |
JP (1) | JP5574414B2 (en) |
Cited By (1)
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---|---|---|---|---|
US11651793B1 (en) * | 2022-01-05 | 2023-05-16 | Western Digital Technologies, Inc. | Disk hub for retaining magnetic recording media for film thickness measurement |
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